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1/* Copyright (C) 2007-2018 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_EVENTFD_H
19#define _SYS_EVENTFD_H 1
20
21#include <stdint.h>
22
23/* Get the platform-dependent flags. */
24#include <bits/eventfd.h>
25
26/* Type for event counter. */
27typedef uint64_t eventfd_t;
28
29
30__BEGIN_DECLS
31
32/* Return file descriptor for generic event channel. Set initial
33 value to COUNT. */
34extern int eventfd (unsigned int __count, int __flags) __THROW;
35
36/* Read event counter and possibly wait for events. */
37extern int eventfd_read (int __fd, eventfd_t *__value);
38
39/* Increment event counter. */
40extern int eventfd_write (int __fd, eventfd_t __value);
41
42__END_DECLS
43
44#endif /* sys/eventfd.h */
45

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